S表的主键是供应商号,P表的主键是零件号。P表的“颜色”属性只能取值为(红,白,蓝)

题型:单项选择题

问题:

S表的主键是供应商号,P表的主键是零件号。P表的“颜色”属性只能取值为(红,白,蓝)。下列操作正确的是()。

A.将S表的供应商号='Z01'修改为,'Z02'

B.将S表的供应商号='B01'修改为'Z02'

C.将S表的供应商号='Z01'修改为'T20'

D.将P表的颜色='红'修改为'绿'

考点:计算机等级考试数据库技术国家计算机三级(数据库技术)81
题型:单项选择题

MRP的中文表述为()。

A、主生产计划

B、制造资源计划

C、物料需求计划

D、企业资源计划

题型:单项选择题

提示病理性心脏病杂音的特点,哪项不妥()

A.舒张期,轻度杂音

B.占全收缩期者

C.粗糙吹风样

D.低调隆隆样

E.局限于心尖区者

题型:单项选择题

数据库的物理设计的目的是( )。

A) 导出特定的DBMS可以处理的数据库模式和外模式
B) 产生反映企业组织信息需求的数据库概念结构
C) 收集支持系统目标的基础数据及处理方法
D) 找到一个有效、可实现的数据库存储结构

题型:单项选择题

企业的业务()往往可以加速企业重组。

题型:单项选择题

American Museum of Natural History is one of the largest natural and historic museums in the world and one of the main natural history research and education centres in the United States, set up in 1869 and located in the west of the Central Park, Manhattan District, New York. It (1) 7 hectares in its total area, (2) classical types of buildings. The (3) of ancient creatures and humanity is (4) the first place of all the museums in the world, (5) the representative samples from South America, Africa, Europe, Asia and Australia were collected, besides those from the (6) country, the United States.

In the museum, there are five kinds of exhibits, including astronomy, mineralogy, human history, and animals in the (7) times and those in modern times. There are thirty-eight exhibition halls with different (8) from 500 to 1,500 square metres. Besides these, there is a Roosevelt Memorial Hall in (9) of President Roosevelt who supported the (10) of the museum, which is also used to have a special exhibition, showing the new important (11) on natural sciences and (12) affairs and social problems, and special topics connected closely with the life of the citizens. Besides this, it is also used for avocation (13) to have all kinds of scientific activities in the laboratories, centres of natural science and centres for citizens. There are more than 10 (14) research departments mainly (15) for collection of samples, research and work of publication.

In the museum, there are (16) and sub-libraries of Aulspond ancient amniote, with about 300 thousand books and magazines (17) natural history, many of (18) are very valuable monographs for the first edition. It has published many expert books and magazines, and a large number of propaganda materials, (19) which are the two magazines, Natural History and Members of Museum that have the biggest (20) of their magazines.

5()

A.where

B.that

C.which

D.whose

更多题库